Allocate 16k scratch on heap

[justsmth]

Issues:

Addresses: P169365635

Description of changes:

• Allocate large value on the heap instead of stack.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.87%. Comparing base (096f73a) to head (25b951e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1991      +/-   ##
==========================================
+ Coverage   78.86%   78.87%   +0.01%     
==========================================
  Files         593      593              
  Lines      101934   101933       -1     
  Branches    14450    14451       +1     
==========================================
+ Hits        80386    80403      +17     
+ Misses      20904    20885      -19     
- Partials      644      645       +1     

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